7.Using Eulers formula find the unkwon,
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Answer: (i) Faces-?,vertices-6,edges-12
Euler's formula: F+V–E=2
F+6–12=2
F=2+12–6=8
F=8
(ii) Faces-5,vertices-?,edges-9
Euler's formula: F+V–E=2
5+V–9=2
V=2+9–5=6
V= 6
(iii) Faces-20,vertices-12,edges-?
Euler's formula: F+v–E=2
20+12–E=2 ,
E=20+12–2
E=30
explanation: hope it helps
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